Superhuman has acquired GPTZero, an artificial intelligence detection startup co-founded in 2023 by Edward Tian and Alex Cui. Financial terms of the transaction remain undisclosed, though PitchBook values GPTZero at over $88 million. The company recently surpassed 19 million registered users and achieved $30 million in annual recurring revenue. Following the deal, Tian and Cui will join Superhuman to lead a newly created authenticity division, transferring their entire 30-person engineering and product staff to the organization. Superhuman, the parent company behind Grammarly, rebranded after acquiring the Silicon Valley-preferred email platform Superhuman and now operates a broad suite of digital productivity tools. The acquisition significantly expands Superhuman’s existing content verification infrastructure, which includes the Grammarly AI detector and Authorship verification software. GPTZero’s detection capabilities will soon be integrated into Superhuman Go, the company’s cross-platform AI assistant, while the platform will continue to function as a standalone product. The move addresses surging demand for content authenticity across education, journalism, recruiting, and consulting. Superhuman CEO Shishir Mehrotra indicated that academic institutions currently generate roughly one-third of the $700 million annual revenue for Grammarly, with the remainder driven by professional enterprise clients. As synthetic media and text proliferate across digital ecosystems, Mehrotra stressed that industry efforts must evolve beyond basic detection to preserve critical thinking and source credibility. Guided by Mehrotra’s prior experience at Google, Superhuman has pursued an aggressive expansion strategy designed to scale acquired technologies rapidly. GPTZero marks the company’s fourth major acquisition, following purchases of Coda, the Superhuman email app, and Rows AI. Superhuman plans to utilize its 40 million daily active users as a distribution foundation to accelerate growth for the new technology. Tian noted that the partnership fulfills GPTZero’s founding mandate of preserving human authorship, now adapted to safeguard analytical rigor in an automated digital landscape. Existing investors, including Uncork Capital, Neo, Footwork, and Jack Altman, remain part of the structure.